Cheat mode:
Start the game with the "-devuser" command line parameter. Then
press "~" during game play to display the console window. Type help as a
console command to display all the cheat codes. Enter one of those codes
at the console window to activate the corresponding cheat function.
Effect Code
Invincibility god
Unlimited ammo ammo
Toggle gun model display gun
Multiply game speed by indicated factor speed #<number>
Instantly kill bugs when targeted evileye
Invincibility, instant kill, and fast speed banzai